Yeah there is a lot of misdiagnosis... main thing for BPD seems to be a problem with regulating emotions. That can express itself through many things. I can't regulate my emotions, so when angry I can't control myself. When sad, I can't control it, when happy, I can't control it and it get out of hand quickly... then I have a 100 ideas, but don't follow through on any of them. I buy things I don't need, and so forth. It really wrecks my life.
Same with having OCD, people think that if I have OCD I wash my hands 100 times a day. Well, I don't, but some do. I'm more of the memory OCD: constantly hearing and repeating words in my head, have to read license plates (and remembering them), doing things over, and over and over. Sometime annoying, but it makes me peaceful. Never knew I had OCD, but apparently I have it.